With approximately 50 percent of the U.S. dog population composed of mixed breeds, it's a question many dog lovers hear. In the past, guesses at the breed mix were based on appearance and temperament, but now DNA testing can unlock the mystery of a dog's genetic heritage.

With approximately 50 percent of the U.S. dog population composed of mixed breeds, it's a question many dog lovers hear. In the past, guesses at the breed mix were based on appearance and temperament, but now DNA testing can unlock the mystery of a dog's genetic heritage.

Reading assistance dog programs are popping up at libraries, schools and nonprofit organizations. Both organizers and participants say the literacy dogs are making a significant difference in the lives of children.

Reading assistance dog programs are popping up at libraries, schools and nonprofit organizations. Both organizers and participants say the literacy dogs are making a significant difference in the lives of children.

Is it true that seven human years are equivalent to one dog year? Can dogs really smell cancer? Here, we debunk some commonly held canine myths.

Dog Age Though many believe one human year equals seven dog years, this is a common misconception. When your dog reaches 2 years of age, it will age about five dog years to every human year in smaller to medium-sized breeds, and one human year for every six to seven dog years in larger breeds.

Nose Color A dog's nose can actually change color in the winter months due to a condition called snow nose (or winter nose). In winter months, owners of black-nosed dogs may notice their pets' noses turning a pinkish color, which is believed to be caused by an enzyme deficiency. Any sudden changes should be examined by a veterinarian.

Dog Doctor The ability of dogs to detect cancer via scent receptors ("their sniffer") is, in fact, a truth. A German research report revealed that dogs are able to find early-stage lung cancer, and countless reports have revealed that canines can sniff a cancerous growth in humans long before the growth is visible with the naked human eye.

Tail Wagging When a dog wags its tail, it is not necessarily a sign of friendliness. Dogs wag when they are fearful, disconcerted, aroused and more. Watch its body language, such as posture and ear positioning, and always ask a dog's owner about petting it first.

Eating Grass Dogs that eat grass are not necessarily sick. Some dogs may like the taste, but other theories suggest their bodies might instinctively crave nutrients that are lacking in their regular diet.

Guilt Trip Finding a puddle of piddle in the house may not be pleasant for humans, but dogs do not feel guilt when humans disapprove. Instead, they are reacting to the emotional response of their owner, regardless of when the accident occurred.

Carol Bryantis the Social Media and PR Director for Fido Friendly magazine. A frequent media contributor, Carol is a two-time nominee from the Dog Writers Association of America, and she maintains her own dog blog, Fidose of Reality. Her articles have previously appeared in The Dog Daily.

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